Wagon hoist



- Jan. 10, 1961 v. J. LUNDELL 2,967,735

WAGON HOIST Filed Jan. 5, 1955 2 Sheets-Sheet 1 Vernon J Lunae// IN V ENTOR.

Jan. 10, 1961 v. J. LUNDELL WAGON HOIST 2 Sheets-Sheet 2 Filed Jan. 5,1955 INVENTOR. 1 6/7700 I 411/0042 WAGQN HOIST Vernon J. Lundell,Cherokee, Iowa Filed Jan. 5, 1955, Ser. No. 479,995

1 Claim. (Cl. 298-22) My invention relates to a Wagon hoist.

An object of my invention is to provide a wagon, hoist which willreadily raise the forward end of a wagon so that the contents thereofwill pass out of the wagon.

A further object of my invention is to provide a hoist which is simplein construction, economical to manuu d; which doe not equir h use umbrsome tracks or other arrangements.

A further object of my invention is to provide a hoist in whichhydraulic pressure is used to raise the hoist, and to further provide ahoist which need be attached only at one portion of the wagon.

A further object of my invention is to provide a unit in which thepressure is applied laterally instead of longitudinally of the wagon toprovide a strong bracing type of hoist and yet which is of maximumefriciency.

With these and other objects in view, my invention consists in theconstruction, arrangement, and combination of the various parts of mydevice, whereby the objects contemplated are attained, as hereinaftermore fully set forth, pointed out in my claim, and illustrated in theaccompanying drawings, in which:

Figure l is a forward elevation of the hoist in its collapsed position,

Figure 2 is a forward elevation showing the hoist in its raisedposition,

Figure 3 is a sectional view of Figure 2 taken along the lines 3-3thereof,

Figure 4 is a side elevation of the complete Wagon box and hoist, and

Figure 5 is a detail.

My invention contemplates the provision of a wagon hoist for raisingpivoted wagon boxes which is easy to install and which works smoothlyand at maximum efficiency.

I have used the character It) to indicate a wagon box which is pivotedat 11 to the vertical members 12 which are attached to the rear axle 13of the wagon, the character 14 indicating the forward transverse axle,the character 15 indicating a brace.

The character 16 indicates the equally spaced transverse beams which aresecured to the longitudinally positioned parallel beams 17, there beinga pair of such beams 17 in the usual wagon construction.

Attached to the forward axle 14 is a spacer 18 to which is attached thelateral beam 19, to which beam 19 are attached the members 20.

Receiving the transverse beam 19 is a channel member 21 to which isrigidly secured the spaced pipes 22, and passing through the pipes 22are the lengthened bolts 23 which are secured to the arms 24, the arms24 also including the upper bolts 25 and 26, it being noted that thereare two pairs of arms 24. Pivotally secured to one of the bolts 25 isthe end 27 of a hydraulic cylinder 28 which includes a suitable pistontherein, to which piston is attached the piston rod 29, which rod 29 isjournalled at 30 onto the transverse bolt 26.

Pivotally attached to the terminals of the arms 24 are '1? aired tatesFeimi 5 i the further bars 31 which are loosely pivoted thereto at 32,the pivoting at these points being within fairly large openings orwithin slots 33 (see Figure 5).

The arms 31 are pivoted at 34 to the ears 35 which ears 35 are securelyattached to the ends 36 of a framework having the further sides 37, theends 36 being securely attached in any desired manner to the beams 17,the bars 31 being thereby freely pivoted at the ears 35, the characters38 and 39 indicating suitable spacers.

Pivotally attached to one of the arm members 24 at 39a is an equalizingbar 40, Which is pivotally attached at 41 to a further bar 42 which iswelded or otherwise secured to one of the other arms 24 as shown.

Communicating at 43 with the cylinder 28 is a flexible hose 44 which inturn communicates to any desired hydraulic oil source. 7

The hoist operates in the following manner. In its collapsed position asshown in Figure 1, or with the wagon box down, it will be noted that allof the various arms 24 and bars 31 are at the lowest possible point.When it is desired to raise the forward end of the wagon box, the oil isforced through the tube 44 and into the cylinder 28, whichcorrespondingly causes the piston rod 29 to travel in the direction ofthe arrow 45 (see Figure 2). For a certain interval, there will be nolifting effort exerted due to the relatively large clearances betweenthe pivot bolts 32 and the openings in which these bolts are received,or due to the slots 33, it being understood that either form can be usedas long as a lost-motion connection is provided.

These points will remain relatively stationary until the bolts 25 and 26reach the dotted positions shown in Figure 1, at which point the leverarm between the bolts 25 and 26 and the points 23 will be at itsgreatest, and at this point where the greatest pressure is required, orat the initial lifting of the Wagon box, the arms 24 will begin torotate towards an upper position, until they reach the position shown inFigure 2, or even a higher position than this, and during the rotationof these arms, the arms 31 Will also be raised, and since these arms arepivoted at 34 to the framework portions 36 etc., which are attachedsolidly to the wagon framework, the effect will be to raise the forwardend of the wagon, and it will also be noted that the lower channelmember 21 will be pivoted upwardly (see Figure 3) as the wagon box israised since the bars 31 and arms 24 will be at constantly to thischannel member 21, this feature allowing for free pivoting of the unitregardless of the'height to which the end of the box is raised.

It will thus be noted that the piston will apply the greatest pressureWhere necessary, and as the pivoting points 25 and 26 pivot outwardlyand as the wagon begins to lift, the pressure will diminish. However,during the upper portions of the raising action the pressure will not beas great, yet due to the angular change, the raising effect will becomemore rapid, so that as a result, the desirable condition of providingthe maximum pressure at the initial raising, and a faster action fromthen on will provide a highly desirable wagon hoist arrangement.

It will be noted that the hoist will thereby raise or collapse in asmooth and uniform manner, and it will be noted that since the unit isattached to the wagon box itself, it can be conveniently attached towardthe forward end, and need not be attached to the member 19 for instance,and in this way can be provided a simple compact unit.

The equalizing bar 40 will equalize the various arms so that they willwork in a synchronized manner.

It will now be seen that I have provided the advantages mentioned in theobjects of my invention with various other advantages being readilyapparent.

Some changes may be made in the construction and arrangement of theparts of my invention without departing from the real spirit and purposeof my invention, and it is my intention to cover by my claim anymodified forms of structure or use of mechanical equivalents which maybe reasonably included within their scope.

I claim as my invention:

A wagon box hoist comprising a lower base member, a pair of spaced armspivotally attached at one end of said lower base member, a further pairof spaced arms pivotally attached to the other end of said base member,means for spreading said pairs of arms apart, bars pivotally secured tothe outer terminals of said arms, the upper terminals of said bars beingpivoted to a wagon box to raise the same, said means for spreading saidarms apart comprising a hydraulic cylinder, a piston in said cylinder, apiston rod attached to said piston, the end of said piston rod beingpivotally secured to said further pair of said arms at a distance fromthe pivotal attachment of said further arms to said base; said base,said arms, and said bars operating in a plane parallel to the axis aboutwhich the wagon box is pivoted, a framework including ears, means forpivotally attaching the upper ends of said bars to said ears, means forsecuring said framework to said Wagon box, the pivotal connectionbetweeen said arms and said bars being relatively loose to provide alost motion action, a synchronizing bar pivotally attached to said armson one side of their pivot and to an extension of said further arms onthe opposite side of their pivot, said arms and said further arms beingsubstantially in the shape of elongated triangles, one of the corners ofthe shortest side of said triangles being pivoted to said base and theother corners on the shortest side of said triangles being pivoted tosaid cylinder and said piston rod.

References Cited in the file of this patent UNITED STATES PATENTS463,254 Pay Nov. 17, 1891 1,854,212 Miller Apr. 19, 1932 2,180,066Porter Nov. 14, 1939 2,541,210 Cunningham Feb. 13, 1951 2,588,489 DayMar. 11, 1952 2,621,021 Dahl Dec. 9, 1952 2,706,102 Cresci Apr. 12, 1955

